155291904 has 90 divisors (see below), whose sum is σ = 463114190. Its totient is φ = 51757056.

The previous prime is 155291879. The next prime is 155291911. The reversal of 155291904 is 409192551.

It can be written as a sum of positive squares in only one way, i.e., 132710400 + 22581504 = 11520^2 + 4752^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16992 + ... + 24480.

Almost surely, 2^155291904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155291904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231557095).

155291904 is an abundant number, since it is smaller than the sum of its proper divisors (307822286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155291904 is an frugal number, since it uses more digits than its factorization.

155291904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7517 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 155291904 is about 12461.6172305203. The cubic root of 155291904 is about 537.5055318702.

The spelling of 155291904 in words is "one hundred fifty-five million, two hundred ninety-one thousand, nine hundred four".